COLLEGE OF ARTS AND SCIENCES Department of Mathematics and Statistics

  Michael Tsatsomeros

   (Μιχáλης Τσατσóμοιρος)
  Office: Neill Hall 229
  Phone: (509) 335-3144
  Fax: (509) 335-1188
  Email: tsat at

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Research Interests

Linear algebra, matrix analysis, especially the theory of nonnegative matrices and their generalizations. Particular interests include the numerical range; graphs and patterns associated with matrices; numerical linear algebra; applications in dynamical systems, control theory, data analysis, machine learning and artificial intelligence.

Work Experience

Current students:
  • Seong Park, Jesse Lopez, Ben Clark, Allison Roberson, Samir Mondal (IITM)
Completed Ph.D. students:`
  • Wail Alahmadi (Ph.D. 2023)
    Thesis tittle: Convex Sets of Stable Matrices
  • Sushmitha Parameswaran (co-Chair, Ph.D., IIT Madras, 2021)
    Thesis title: On Some Generalizations of the Class of Q-Matrices
  • Hung Le (Ph.D. 2020)
    Thesis title: Matrix Analysis Primer for Inhomogeneous Markov Chains
  • Faith Zhang (Ph.D., 2020)
    Thesis title: Rank One Perturbations and Applications
  • Megan Wendler (Ph.D., 2020)
    Thesis title: Semimonotone Matrices
  • Patrick Torres (Ph.D., 2018)
    Thesis title: Stability Analysis, Convex Hulls of Matrix Powers and Their Relations to P-matrices
  • Michael Kasigwa (Ph.D., 2017)
    Thesis title: Eventual Cone Invariance
  • Thomas Cameron (Ph.D., 2016)
    Thesis title: On the Computation of Eigenvalues, Spectral Bounds and Hessenberg Form of Matrix Polynomials
  • Pietro Paparella (Ph.D., 2013)
    Thesis title: Matrix Roots of Nonnegative and Eventually Nonnegative Matrices
  • Jimmy Burk (Ph.D., 2012)
    Thesis title: Eigenspaces of Tournament Matrices
  • Kent Griffin (Ph.D., 2006)
    Thesis title: Solving the Principal Minor Assignment Problem and Related Computations
  • Bishan Li (Ph.D., 1998)
    Thesis title: Generalizations of Diagonal Dominance in Matrix Theory
Post-doctoral Fellows
  • Fei Zhou (Post-doctoral fellow, 2006)
  • Panos Psarrakos (Post-doctoral fellow, 2000)
    Currently: Professor, Mathematics, National Technical University of Athens
  • Mark Krupnik (Post-doctoral fellow, 1994-1995)
    Currently: Retalon, Inc (inventory management and forecasting tools), Co-founder and President

  • Excellence in Graduate Advising and Mentoring, College of Arts and Sciences, WSU, 2021
  • SPARC Indian Institure of Technology-Madras Collaboration Grant, 2019-2021
  • Outstanding Research Award, Mathematics, WSU, 2007
  • Catalyzing the Future Award, WSU, 2003
  • NSERC Research Grants: 1994-1997, 1997-2001, 2001-2002
  • NSERC Equipment Grants: 1994, 1996, 2001
  • Merit Awards, Univ. of Regina, 1996, 1999

Publications (in reverse chronological order)

Selected Presentations

Current Editorship

Special Editor